[R] group by in data.frame

zem zmanolova at gmail.com
Fri Feb 25 13:15:40 CET 2011


Hi Ivan,

thanks for your replay!
but the problem is there that the dataframe has 20000 rows and  ca. 2000
groups, but i dont have the column with the groupnames, because the groups
are depending on 2 onother columns ... 
any other idea or i didnt understand waht are you posted ... :( 
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